*{
    margin: auto 0;
    padding:0;
    font-family: 微软雅黑;
    /*border: 1px solid;*/
}

.log_out a{
    text-decoration: none;
    margin-left:10px
}
.center{
    display: flex;
    justify-content: center;
}

.center ul{
    height: 300px;
    text-align: center ;
    list-style: none;
}
.center ul li{
    padding-top: 40px;
    border-bottom: 1px dashed lightskyblue;
}
.center ul li a{
    text-decoration: none;
    font-size: 22px;
    font-weight: bold;
}
.center ul li a:hover{
    color: black;
}

.center .menu{
    width: 10%;
    /*background-color:red;*/
    border-right: 1px solid lightskyblue;
}

.center .center_change{
    width: 90%;
    /*background-color:blue;*/
    /*padding-left: 30px;*/
}
